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> > - if (!IS_ENABLED(CONFIG_ARM_SMMU_V3_SVA)) > - return -EOPNOTSUPP; Stuff like this is also optimizing the codegen, it shouldn't be removed. > +int arm_smmu_domain_test_dev(struct iommu_domain *domain, struct device *dev, > + ioasid_t pasid, struct iommu_domain *old_domain) > +{ > + struct arm_smmu_domain *device_domain = to_smmu_domain_devices(domain); > + struct arm_smmu_master *master = dev_iommu_priv_get(dev); > + > + if (!dev_iommu_fwspec_get(dev)) > + return -ENOENT; > + > + switch (domain->type) { > + case IOMMU_DOMAIN_NESTED: { > + struct arm_smmu_nested_domain *nested_domain = > + to_smmu_nested_domain(domain); > + > + if (WARN_ON(pasid != IOMMU_NO_PASID)) > + return -EOPNOTSUPP; > + if (nested_domain->vsmmu->smmu != master->smmu) > + return -EINVAL; > + if (arm_smmu_ssids_in_use(&master->cd_table)) > + return -EBUSY; This gives me alot of pause.. Here we are detecting if a S1 PASID is installed for a S2 attach, but to your purpose this can be made inconsistent by userspace during a FLR.. I don't see any reasonable way to mitigate this?? Which makes me wonder if we should just try to solve the simple obvious things like direct, permanent incompatability and still have some kind of recovery code to leave things in blocking if they fail to attach Jason